Coffee machine



FIG. 1 illustrates a right front perspective view of the coffee machine showing my new design;

FIG. 2 illustrates a front elevation view thereof;

FIG. 3 illustrates a rear elevation view thereof;

FIG. 4 illustrates a right side elevation view thereof;

FIG. 5 illustrates a left side elevation view thereof;

FIG. 6 illustrates a top view thereof; and,

FIG. 7 illustrates a bottom view thereof. 

The ornamental design for a coffee machine, as shown and described. 